sulfationroastingleachingprecipitation SRLP using BA was investigated. A pretreatment process of sulfation and roasting of BA was developed to selectively recover REEs using ammonium oxalate leaching AOL followed by precipitation. Most of the oxides were converted to
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A completely new process of selectively recovering Sc 3+without impurity of Fe 3+from Bayer red mud was developed. Prior to water leaching process, red mud needs to be digested and sulfated at a low temperature and subsequently roasted at a higher temperature for a period of time.
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A sulfationroastingleaching process was developed to selectively leach REEs from bauxite residue red mud. Most of the elements in the bauxite residue convert to their respective sulfates during sulfation. Iron and aluminum sulfates decompose to their respective oxides at
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Sulfationroastingleaching was the preferred leaching technique to dissolve scandium from bauxite residue because of the low acid consumption, good selectivity towards scandium and low codissolution of the major elements. The scandium concentration in the leachate was increased by applying multistage leaching,
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Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed
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A pretreatment process of sulfation and roasting of BA was developed to selectively recover REEs using ammonium oxalate leaching AOL followed by precipitation. Most of the oxides were converted to their respective sulfates during sulfation. By roasting, unstable sulfates mostly iron decomposed into oxides, while the REE sulfates remained
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Nov 10, 2017· The effect agitation on the leaching efficiency of REE from bauxite residue in 1.5 M H 2SO 4 at 90 °C with and without microwave pretreatment within 30 min residence time. The dashed lines represent the maximum leaching efficiency that could be achieved using 3 M HNO 3 at 90 °C without microwave pretreatment.
Inquire Now07/10/2015 Bauxite residue conference 3 IntroductionKarst bauxites are rich in rare earth elements REEsReport to bauxite residue in Bayer processDirect leachinglow recoveries or high iron dissolutionProblem in downstream processesSulfationroastingleaching processselective recoveryFirst study on
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The recovery of scandium from bauxite residue was studied by selective sulfation roasting and water leaching. The sulfation roasting process of bauxite residue with concentrated sulfuric acid was
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The alkali roastingsmeltingleaching process allows recovery of aluminum, iron, titanium, and REEs from bauxite residue. The residue generated in this process can be used in building materials and
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drometallurgical process, the most widely used pretreatment process is roasting before leaching. There are th ree common roasting methods: oxidation roasting, chlorination roasting and sulfation roasting. Oxidation roasting needs high roasting temperature and copper will suffer a loss by generating copper ferrite. The exhaust gas SO 2, Cl 2, HCl from the furnace in chlorination roasting process is a threat
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Feb 07, 2019· A method for recovering scandium from red mud waste resulting from bauxite mining, comprising: sulphating the red mud by adding sulfuric acid for converting oxides to sulfates; roasting the sulphated red mud until less than 5 ppm iron sulfate and titanium sulfate remain; agitating a leach mixture including the roasted red mud by sonication or
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Apr 01, 2019· The sulfationroastingleaching process is a technique that reduces the conventional sulfation roasting stages. This process was first introduced to extract nickel and cobalt from ironrich lateritic ores selectively Borra et al., 2016. In recent years, this method has been applied to selective recovery of rare earths from bauxite residue Borra et al., 2016; Onghena et al., 2017. The sulfationroastingleaching
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Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed
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Oct 10, 2002· A pilotplant process has been developed based on an innovative laboratoryscale method for the recovery of scandium that exists in economically interesting concentrations in red mud, the main byproduct of alumina production. This method includes acid leaching of the red mud pulp, ionexchange separation of scandium and lanthanides from the coleached main elements such as iron,
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Sulfationroastingleaching was the preferred leaching technique to dissolve scandium from bauxite residue because of the low acid consumption, good selectivity towards scandium and low co
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A pretreatment process of sulfation and roasting of BA was developed to selectively recover REEs using ammonium oxalate leaching AOL followed by precipitation. Most of the oxides were converted to their respective sulfates during sulfation. By roasting, unstable sulfates mostly iron decomposed into oxides, while the REE sulfates remained
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Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed with water and concentrated H 2 SO 4 followed by drying, roasting and then leaching of the roasted product with water. Most of the oxides were converted to their respective sulfates during the sulfation process.
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the further recovery processes. Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed with water and concentrated H 2SO 4 followed by drying, roasting and then leaching of the roasted product with water.
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Recent efforts have also been made to recover REEs from bauxite residue and from NdFeB magnets by sulfation, selective roasting, and water leaching [ 30, 31 ]. The key outcome in these processes is a total dissolution of the rare earth sulfates in water, while iron, nickel,
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After completely transforming powdered samples into a sulfate mixture, a suitable selective roasting and water leaching treatment resulted in 95100 % extraction efficiencies for Nd, Dy, Pr, Gd, Tb, and Eu, while Fe remained in the resultant residue forming a marketable hematitedominated byproduct.
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Aug 11, 2016· Borra et al. studied the sulfationroastingleaching process for recovering REEs from bauxite residue, which is similar to the acid baking process . They were able to recover about 60 % of Sc and >80 % other REEs. The dissolution of other major elements are Na > 90 %, Al~20 %, Fe < 1 %, Ti < 1 %, and Ca~5 % at L/S ratio 5:1.
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The recovery of scandium from bauxite residue was studied by selective sulfation roasting and water leaching. The sulfation roasting process of bauxite residue with concentrated sulfuric acid was investigated by XRD, SEM and TGDSC techniques. The results showed that metal oxides in bauxite residue were firstly transformed into their respective sulfates during the sulfation roasting process,
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An alternative process called sulfationroastingleaching, was also developed to selectively leach the REEs. In this process bauxite residue was mixed with water and concentrated H2SO4 followed by drying, roasting and finally leaching of the roasted product in water. REEs were selectively leached by this process however, the scandium recovery is low. The residue generated in this process, could be used
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The amount of sulfate formation ofNi, Co, he sulfation roasting for 56 min, due to the protective on Yu et al., 2012. It can also be observed that the 87% in Figure 15 after reaching plateau, showing leaching after sulfation roasting. Elemental sulfur sulfur dissolution after 30 min in Figure 15.
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Due to drawbacks of the direct leaching route from bauxite residue, such as silica gel formation and low selectivity towards these valuable metals, a novel leaching process based on oxidative
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Mar 19, 2018· Selective sulfation with SO 2 followed by water leaching has also been proposed for extraction of manganese from manganese oxide ore with high iron content [29]. Recent efforts have also been made to recover REEs from bauxite residue and from NdFeB magnets by sulfation, selective roasting, and water leaching [30, 31].
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Aug 18, 2019· Bauxite is an ore that contains a large amount of aluminum hydroxide Al 2 O 3 ·3H 2 O, along with other compounds.Extraction Process of Aluminium from
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Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed with water and concentrated H2SO4 followed by drying, roasting and then leaching of the roasted
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The recovery of scandium from bauxite residue was studied by selective sulfation roasting and water leaching. The sulfation roasting process of bauxite residue with concentrated sulfuric acid was
Inquire NowTherefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed
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Mar 11, 2019· The process also transforms red mud to a new structured residue containing calcium silicate and calcium carbonate as the main components, which may directly be used for producing cement or soil, so that all the valuable components in bauxite residue
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Nov 15, 2019· Based on our previous study , the ironremoved bauxite residue BR used in this study was collected after the optimized reductive roasting and magnetic separation process 5 wt% sodium sulfate and 10 wt% sodium carbonate, roasting at 1100 °C, magnetic intensity with 0.1 T. In this process the iron in bauxite residues was extracted at efficiency of 90%.
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Nov 15, 2019· Bauxite residue BR is a hazardous industrial waste and also becomes an important reserve of rare earth elements REE. An elegant process for achieving separation of REEs against silica from an ironremoved BR was established in this paper through selective leaching of silica with simultaneous enrichment of REEs.
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Leaching ARWL, sometimes referredto as sulfation roasting. These techniques both involve mixing the bauxite residue with concentrated sulfuric acid to sulfate the component minerals, then heattreating the acidsolids mixture to accelerate the reaction, before finally leaching the heattreated material in water at ambient conditions.
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Therefore, a combined sulfationroastingleaching process was developed to selectively leach the REEs while leaving iron undissolved in the residue. In this process bauxite residue was mixed
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Bauxite residues also known as red mud, Bayer process tailings or bauxite process tailings are generated from alumina production where bauxite is digested in hot NaOH solution via the Bayer process.22 The production of 1 tonne of alumina generates between 1 and 1.5 tonnes of bauxite residue.23 Currently, the yearly global production of bauxite residues is 150 million tonnes Mt24 and
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07/10/2015 Bauxite residue conference 3 IntroductionKarst bauxites are rich in rare earth elements REEsReport to bauxite residue in Bayer processDirect leachinglow recoveries or high iron dissolutionProblem in downstream processesSulfationroastingleaching processselective recoveryFirst study on
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